> -----Original Message----- > From: Bruce Richardson <bruce.richard...@intel.com> > Sent: Tuesday, August 31, 2021 10:03 AM > To: Juraj Linkeš <juraj.lin...@pantheon.tech> > Cc: Piotr Kubaj <pku...@anongoth.pl>; David Christensen > <d...@linux.vnet.ibm.com>; tho...@monjalon.net; > david.march...@redhat.com; honnappa.nagaraha...@arm.com; > ruifeng.w...@arm.com; ferruh.yi...@intel.com; jerinjac...@gmail.com; > jer...@marvell.com; step...@networkplumber.org; dev@dpdk.org > Subject: Re: [PATCH v5] build: optional NUMA and cpu counts detection > > On Tue, Aug 31, 2021 at 07:54:16AM +0000, Juraj Linkeš wrote: > > > > > > > -----Original Message----- > > > From: Piotr Kubaj <pku...@anongoth.pl> > > > Sent: Tuesday, August 31, 2021 2:55 AM > > > To: Juraj Linkeš <juraj.lin...@pantheon.tech> > > > Cc: David Christensen <d...@linux.vnet.ibm.com>; tho...@monjalon.net; > > > david.march...@redhat.com; bruce.richard...@intel.com; > > > honnappa.nagaraha...@arm.com; ruifeng.w...@arm.com; > > > ferruh.yi...@intel.com; jerinjac...@gmail.com; jer...@marvell.com; > > > step...@networkplumber.org; dev@dpdk.org > > > Subject: Re: [PATCH v5] build: optional NUMA and cpu counts > > > detection > > > > > > Hi, > > > > > > sorry for the late answer. > > > > Thanks for the answer anyway, better late than never. > > > > > > > > I suppose you mean sysctl command, not systemctl. > > > > > > > That's right. What does lscpu say? Are the NUMA nodes non-contiguous like > this?: > > NUMA node0 CPU(s): 0-63 > > NUMA node8 CPU(s): 64-127 > > NUMA node252 CPU(s): > > NUMA node253 CPU(s): > > NUMA node254 CPU(s): > > NUMA node255 CPU(s): > > > > > On dual CPU systems, it returns 2. On single CPU ones, 1. > > > > I asked the previous question so that we know the actual numa node number > of the second CPU. If it's 8, then sysctl does some renumeration and we can't > use it. > > > > Bruce, maybe we should just parse lscpu output? That introduces a > dependency, but that may not be such a big deal as lscpu is pretty common. > > > Until we are sure that we need it, can we just keep things simple? Perhaps we > can use lscpu if present, and fallback to sysctl output if not.
Piotr says lscpu isn't available on ppc FreeBSD. I think this leaves us with two options: 1. either use sysctl with the risk that it may not return an accurate value 2. not support PPC for numa detection What do you think?
